Lepidoptera of Pakistan based upon the Info-system of the Cesa I-Geometridae. Cesa News 77: 1-76, 22 figs. This article deals with the Lepidoptera of Pakistan. It is based on the literary data, as well as the information of the Cesa collection based upon the expedition realized in 1987. In the part of Introduction, general faunistical and zoogeographical evaluations are made. Various lists of the genera of 51 families are given. 802 publications are listed and classified according to various bibliographical subjects. In the first part, 178 species of the family Geometridae are listed faunistically together with their synonyms, and distributional codes. Totally 8 genera, and 15 species are new records to the fauna of Pakistan. Among them 22 species are illustrated.